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Graduate Junior Software Developer Jobs in O Fallon, MO

Interco

Junior Software Developer

Saint Louis, MO · On-site

$60K - $65K/yr

Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role ...

Interco

Junior Software Developer

Saint Louis, MO

$60K - $65K/yr

Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role ...

Interco Trading

Junior Software Developer

Saint Louis, MO · On-site

$60K - $65K/yr

Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role ...

CEdge Inc

Jr Software Developer

Saint Louis, MO · On-site

$63K - $82K/yr

... Developer , located in Saint Louis, MO. If you are ready to work alongside World Renowned ... Contribute as a Junior Software Developerwithin an Agile/Scrum team to advance the development ...

CACI

Junior Application Developer

Saint Louis, MO · On-site

$53K - $106K/yr

Junior Application Developer Job Category: Information Technology Time Type: Full time Minimum ... Contribute to modern web-based software that directly supports national security missions. Gain ...

APC Integrated Services

Junior SQL Developer

O Fallon, MO · On-site

$62K - $81K/yr

Position: Jr. SQL Developer Location: O'Fallon, MO (On-Site) Reports to: Implementation Manager Position Status: Exempt About Us: Automotive Product Consultants (APC) provides an array of services in ...

Sovereign Technologies

Junior C# Developer

Saint Louis, MO · On-site

$63K - $82K/yr

The individual in the Programmer Analyst role is responsible for using technical skills and programming experience to define and program solutions to problems and requests of varying difficulty with ...

Sovereign Technologies

Junior C# Developer

Saint Louis, MO

$65K - $84K/yr

Company Description The individual in the Programmer Analyst role is responsible for using technical skills and programming experience to define and program solutions to problems and requests of ...

Leidos

Entry Level Software Developer

Saint Louis, MO · On-site

$57K - $104K/yr

The Leidos Maritime ASET team has an opening for a junior (entry level) software developer to work on the design and coding with software solutions for 6 month - temporary to permanent hire position.

Leidos

Entry Level Software Developer

Saint Louis, MO · On-site

$57K - $104K/yr

The Leidos Maritime ASET team has an opening for a junior (entry level) software developer to work on the design and coding with software solutions for 6 month - temporary to permanent hire position.

Software Technology Inc

Java Developers

Maryland Heights, MO · On-site

$49.25 - $63.75/hr

Software Developer Designs, develops, modifies, enhances and implements software systems designed ... Provide mentorship and coaching to entry, junior and associate level team members, including ...

Software Technology Inc

Java Developers

Maryland Heights, MO · On-site

$49.25 - $63.75/hr

Software Developer Designs, develops, modifies, enhances and implements software systems designed ... Provide mentorship and coaching to entry, junior and associate level team members, including ...

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Graduate Junior Software Developer information

See O Fallon, MO salary details

$22.5K

$83.2K

$128.6K

How much do graduate junior software developer jobs pay per year?

As of Sep 13, 2026, the average yearly pay for graduate junior software developer in O Fallon, MO is $83,235.00, according to ZipRecruiter salary data. Most workers in this role earn between $62,700.00 and $81,400.00 per year, depending on experience, location, and employer.

What is a graduate junior software developer?

Graduate Junior Software Developers are entry-level professionals who have recently completed their university degrees, typically in computer science or a related field. They are responsible for assisting in the design, development, testing, and maintenance of software applications under the guidance of more experienced developers. This role is designed to help new graduates build practical experience, learn industry best practices, and develop their coding and problem-solving skills in a professional environment.

What types of projects can a graduate junior software developer expect to work on during their first year?

As a Graduate Junior Software Developer, you’ll typically start by supporting senior developers on existing projects, such as fixing bugs, writing unit tests, and implementing small features. Over time, you may be assigned to work on new development projects, collaborate on code reviews, and assist in designing software solutions. These tasks help you become familiar with the company’s technology stack, coding standards, and development processes, while also providing opportunities to learn from more experienced team members.

What are the key skills and qualifications needed to thrive as a graduate junior software developer, and why are they important?

To thrive as a Graduate Junior Software Developer, you need a solid understanding of programming languages (such as Java, Python, or C#), problem-solving skills, and a relevant degree in computer science or a related field. Familiarity with version control systems like Git, basic knowledge of databases, and exposure to IDEs and development frameworks are typically required. Strong attention to detail, eagerness to learn, and effective collaboration set exceptional candidates apart. These skills and qualities are essential for building reliable software, adapting to evolving technologies, and contributing positively to a development team.

What cities near O Fallon, MO are hiring for Graduate Junior Software Developer jobs?

Cities near O Fallon, MO with the most Graduate Junior Software Developer job openings:

Graduate Junior Software Developer jobs near you
Infographic showing various Graduate Junior Software Developer job openings in O Fallon, MO as of August 2026, with employment types broken down into 88% Full Time, 8% Part Time, and 4% Contract. Highlights an 85% Physical, 4% Hybrid, and 11% Remote job distribution, with an average salary of $83,235 per year, or $40 per hour.

Junior Software Developer

Saint Louis, MO • On-site

Interco
Clean Energy Semiconductors Manufacturing • 51 - 200 employees
Learn more about Intercoexternal

$60K - $65K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Re-posted 17 days ago

Job description

Company Description
Interco is a global metals trading and recycling company headquartered in St. Louis with facilities in Missouri and Illinois. The company buys, sells, and processes nonferrous metals and electronics scrap worldwide utilizing established partnerships with end consumers in the United States, Europe, Latin America, and Asia.
Job Description
Interco is seeking a talented Junior Software Developer with a strong background in JavaScript and React.js to contribute to an innovative Enterprise Resource Planning (ERP) project. In this role, the successful candidate will take the lead in crafting and executing sophisticated user interfaces for the company's ERP software, aiming to deliver an unparalleled user experience. The Software Developer will collaborate with development team members and management to ensure projects align with the needs of the company. This role involves turning project requirements into functional, visually captivating interfaces that solve problems, optimize workflows, and provide valuable data that offers real-time business insight. Join Interco to be at the forefront of developing solutions that redefine efficiency and impact in ERP systems.
Responsibilities Include
  • Develop responsive and user-friendly front-end interfaces for our ERP software using JavaScript, HTML, CSS, and React.js.
  • Collaborate with development team to design, consume, and integrate RESTful APIs that retrieve and update data from PostgreSQL backends.
  • Work closely with UI/UX designs to translate wireframes and mockups into functional user interfaces, ensuring consistency with design guidelines and best practices.
  • Participate in defining API contracts, perform contract and integration debugging, and collaborate on end-to-end testing. Collaborate on CI/CD pipelines and use containerized development environments.
  • Write and maintain technical documentation.
  • Implement and maintain reusable components and libraries to streamline development and ensure consistency across ERP software.

Qualifications
  • Bachelor's degree in Computer Science, Software Engineering, or a related field.
  • Proven experience as a Software Developer, building complex web applications or ERP systems with a portfolio representative of a strong technical acumen.
  • Proficiency in front-end technologies such as HTML5, CSS3, JavaScript, and various front-end frameworks (e.g., React, Angular, Vue.js) with a solid understanding of responsive design principles.
  • Practical experience consuming and integrating RESTful APIs; experience building RESTful APIs with FastAPI is a plus.
  • Solid working knowledge of PostgreSQL (writing queries, schema design, indexing, migrations)
  • Experience with version control systems and collaboration tools such as Git and Figma.
  • Strong problem-solving skills and attention to detail to identify and resolve issues effectively.
  • Excellent communication and teamwork skills to collaborate with cross-functional teams effectively.

Additional Information
  • $60,000-$65,000
  • Salary plus annual performance review and bonus
  • 401(k) with generous company match after one year
  • Paid vacation Christmas Eve through - New Year's Day for all employees
  • Accelerated paid Vacation time
  • Company paid $25K life insurance policy
  • 100% Company-paid Short-Term Disability, Long-Term Disability
  • 100% Company-paid Medical, Dental, Vision

As a matter of company policy, the Company does not sponsor employment visas or hire from out of the USA nor does the company sponsor candidates who do not currently reside within the USA without an existing H-1B visa.
This job description is designed to provide a general overview of the requirements of the job and does not entail a comprehensive listing of all activities, duties or responsibilities that will be required. Interco reserves the right to modify this job description at any time, including assigning or reassigning job duties or eliminating this position at any time.
Candidate information will be kept confidential according to EEO guidelines.
Work remotely: No
www.intercojobs.com
Company Information
Interco has been recycling computers, batteries, metals, and electronics with a focused track record of innovation and integrity since 1996. The company specializes in the placement of smelter-ready materials catering to commercial, industrial, dealer, and government organizations nationwide.
The Interco recycling facilities are separated into three departments: nonferrous metals, computers and electronics, and battery processing. The nonferrous facility is located on the 40-acre main campus in Madison (IL) while the computers and electronics are processed in Edwardsville where the Administrative and some logistics offices are located. The commercial department is located on The Hill in St. Louis.
www.intercojobs.com

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